Wannier-Stark ladder in the linear absorption of a random system with scale-free disorder



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Díaz García, Elena and Domínguez-Adame Acosta, Francisco and Kosevich, Yu and Malyshev, Andrey (2006) Wannier-Stark ladder in the linear absorption of a random system with scale-free disorder. Physical Review B, 73 (17). ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.73.174210


We study numerically the linear optical response of a quasiparticle moving on a one-dimensional disordered lattice in the presence of a linear bias. The random site potential is assumed to be long-range correlated with a power-law spectral density S(k)similar to 1/k(alpha), alpha > 0. This type of correlation results in a phase of extended states at the band center, provided alpha is larger than a critical value alpha(c) [F. A. B. F. de Moura and M. L. Lyra, Phys. Rev. Lett. 81, 3735 (1998)]. The width of the delocalized phase can be tested by applying an external electric field: Bloch-like oscillations of a quasiparticle wave packet are governed by the two mobility edges, playing now the role of band edges [F. Dominguez-Adame , Phys. Rev. Lett. 91, 197402 (2003)]. We demonstrate that the frequency-domain counterpart of these oscillations, the so-called Wannier-Stark ladder, also arises in this system. When the phase of extended states emerges in the system, this ladder turns out to be a comb of doublets, for some range of disorder strength and bias. Linear optical absorption provides a tool to detect this level structure.

Item Type:Article
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© 2006 The American Physical Society.
Work at Madrid was supported by MEC Project No. MAT2003-01533. Yu.A.K. acknowledges support from Generalitat Valenciana Grant No. CTESIN/2005/022. V.A.M. acknowledges support from NanoNed, a national nanotechnology programme coordinated by the Dutch Min istry of Economic Affairs, and from ISTC Grant No. 2679.

Uncontrolled Keywords:Range Correlated Disorder, Metal-Insulator-Transition, 1d Anderson Model, Delta-Doped Gaas, Bloch Oscillations, Electric-Field, Semiconductor Superlattices, Radiative Lifetime, Optical-Properties, Frenkel Exciton
Subjects:Sciences > Physics > Materials
ID Code:27396
Deposited On:21 Nov 2014 13:10
Last Modified:21 Nov 2014 13:10

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